API® 5-in-1 Aquarium Test Strips
API® 5-in-1 Aquarium Test Strips provide a quick and easy way to test the five most important water parameters: pH, KH, GH, nitrate, and nitrite. Simply dip one test strip into the aquarium water and compare the resulting colors to the color card included in the kit to identify potential water issues that could harm your fish.
Each kit includes clear instructions on how to interpret the test results and adjust water conditions accordingly. Regular weekly testing helps maintain a healthy environment for your aquatic pets.
| Parameter | Test Method |
|---|---|
| pH | Color change on strip |
| Carbonate Hardness (KH) | Color change on strip |
| General Hardness (GH) | Color change on strip |
| Nitrate | Color change on strip |
| Nitrite | Color change on strip |
FAQ
How often should I test my aquarium water using these strips?
We recommend testing your aquarium water once per week to monitor water conditions and maintain a healthy environment for your fish.
Can I use these test strips for both freshwater and saltwater aquariums?
These test strips are designed for freshwater aquariums only.
Do the test strips need to be stored in a specific way?
Store the test strips in a dry, cool place away from direct sunlight to maintain accuracy and shelf life.

Justin Hamilton –
Easy to use and very accurate. I tested my tank weekly and caught a nitrite spike early. The color comparison is clear and the instructions are straightforward. Great for beginners and experienced aquarists alike.
Andrew Hudson –
Works well for checking pH and nitrate levels. The strips are affordable and the color chart is helpful. I found it easy to follow the results and adjust water parameters accordingly.
Isaac Gill –
I’ve used these strips for three months now and they’ve helped me maintain stable water conditions. The kit includes everything needed and the results are consistent with my digital tester.
Mary Gibson –
The strips work but the nitrite test is a bit less clear than others. Still useful for basic weekly checks. Would recommend for simple monitoring.